text: No. When humans reproduce, there are dominant and recessive traits. They don't just all mix to form a homogeneous blend. Some traits will blend, so skin color may generally even out, but you'll still have the people who are much darker or lighter. And that's just skin. You'll still have tall/short, skinny/fat, wild assortments of hair color and bone structures, etc. Short answer is that genes are so varied that it would be nearly impossible to blend all of humanity into a single homogeneous group.